气藏评价钻探过程中对裂缝性砾岩体储层的保护

廊固凹陷大兴探区沙三段深层多套裂缝性碳酸盐岩砾岩体缺乏储层敏感性资料，主产层压力系数低，评价钻探中钻井液漏失等复杂情况时有发生。结合兴9气藏地质特征及近年来的钻井经验，提出采取优化井身结构、加强地震地质结合随钻跟踪，做好裂缝段钻前预测和钻后检测、根据不同目的层段的地质状况采用相应钻井液体系并做好防漏堵漏措施等措施来实现储层保护。现场应用10口井，钻井周期平均降至105 d，单井平均日产气5×104 m3以上，达到了保护裂缝储层、快速评价建产的目的。该方法的成功应用表明，地质随钻分析相结合是解决裂缝性砾岩气井钻探复杂地质问题的关键。

Fractured conglomerate gas reservoir protection in evaluation drilling

For drilling the deep fractured carbonate conglomerate reservoir of the third section of Shahejie Formation in Daxing exploration zone of Langgu Sag,drilling mud losses can not be avoided,because of the lack of reservoir sensitivity information and the low pressure gradient of main producing formation.Considering Xing 9 reservoir geological characteristics and the drilling experience in recent years,some measures were taken to prevent drilling fluid leaking,as optimizing well scheme,strengthening the integr...